A video posted on Facebook by user Tang WS on Sunday showed maggots and fly eggs in a couple of egg trays in a Giant store. Text accompanying the video said, “Saw this at Giant Hypermarket Tampines. Wonder if they QC their products before displaying them for sale. Fresh eggs or fresh worms?”

A spokesperson for Giant said there were no complaints from customers, but staff members found the contaminated eggs on Monday during the store’s routine pre-opening check, according to media reports.

The spokesperson said several egg trays were discarded, and the area cleaned and sanitised.

Giant lodged a report with its supplier, who upon investigating said there were no abnormalities in samples of the same batch of eggs, and they were safe for consumption.

The supermarket chain will be working with the supplier to prevent a recurrence of such incidents.

The spokesperson said a fly could have laid eggs inside a broken egg found inside an affected tray, resulting in the infestation.

The Agri-Food and Veterinary Authority of Singapore is investigating the incident.